Decoding the Fleur de lis Symbol

I’m searching for more information on this beautiful gold Limoges plaque, that I believe encodes the Fleur de lis, as an esoteric symbol of immortality and divine resurrection…The only information I can find online is from a Pinterest post that simply says ”
anonymous goldsmiths of limoges plaque with three saints rising from the dead 1250″….http://www.mushroomstone.com/fleurdelisorigin.htm